I run -smp 10 , so thats not an issue...(I've also tried it with smp off to doublecheck).

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I tried a few other things to no avail.The 3rd 580's out and crunching happily away in a diff box , I don't care anymore.It really does seem like it's PCH or lane related...could be drivers too....but whatever.

Yeah - like BB said, you only have one passkey associated with your folding username. But you have to enter it into the client config of each individual client you launch. So if, for example, you have two GPU clients and one SMP client, you have to enter your passkey into all three separately.